Category

## Voltage Level Indicator Circuit

In this project, we are going to show you how to design a simple Battery voltage Level Indicator Circuit using very simple available components.

Battery voltage level indicator  indicates the status of the current of the battery just by glowing LEDs in series(Red, Yellow, Green). Res LED Indicates 2 volts, 2nd red LED indicates that the current is now 4 volts, Yellow LED indicates the current is now 7 volts and Green LED indicates that the current is now 12 volts in the battery. In this circuit, we have 1k resistors to control the current in the LED’s you can use a 560-ohm resistor with the last two LEDs because the last two LEDs has on the top level of all LEDs which is why you can use fewer resistors. This project explains to you how to design battery-level indicators with a few components. You can use this circuit to check the car battery or inverter. This circuit helps you to increase the lifetime of the battery.

### Voltage Level Indicator Circuit adjustable

you can change this circuit easily by increasing and decreasing the leds and resistors. If you want to change this circuit as adjustable then please use a variable with it as shown in the diagram.

In this circuit, I have used just a 5 k potentiometer to adjust the measurement of volts. In this way, this circuit becomes more flexible now you can measure even to 40 volts.

### Voltage Level Indicator Circuit Working Principle

The current level indicator circuit work with the help of roisters as well as LEDs. Resistors control current in series with the help of an LED As a current passes through the 1st LED’s current value slows down and that is why the 2nd LED glows on more volts as compared to the 1st LED and in this way 3rd LED required more volts to glow as compare to 2nd led. In this way, the next LED required more volts to glow as compared to the previous. we are using 1 k resistors only for protecting LEDs because LEDs can bear only 1.5 to 3V.

### Voltage Level Indicator Using  Zener Diode

In this circuit, we are going to show you how to build a voltage level indicator with zen-er diodes. In this project, we have used 4 zen-er diodes of different powers to make a perfect voltage level indicator.

A normal diode acts as a short circuit in the forward bias condition while in the reverse bias condition, it acts as an open circuit. A Zener Diode has a breakdown when a certain voltage level is reached. The voltage that passes through the Zener diode is called the breakdown voltage of the zener diode. If a zener has a breakdown voltage of 5.1 V, after 5.1 V or greater is applied to it, it will cross the voltages that power on a load. In this circuit, the type of zener diode we have used are:

1. 1N4728: 3.3V
2. 1N4734: 5.6V
3. 1N4739: 9.1V
4. 1N4742: 12V

According to Zener Diode 1st LED will glow at 3.3v 2nd LED will glow at 5.6v 3rd Led will glow at 9.1v and the last Led will glow at 12.1 volts. In this way, you can increase the no of zener and no of LEDs to make it more suitable.

### Zeners Diodes with Their Breakdown Powers

S.R
Zener no
Voltages
1
1N4728
3.3v
2
1N4729
3.6v
3
1N4730
3.9v
4
1N4731
4.3v
5
1N4732
4.7v
6
1N4734
5.6v
7
1N4735
6.2v
8
1N4736
6.8v
9
1N4737
7.5v
10
1N4738
8.2v
11
1N4739
9.1v
12
1N4740
10v
13
1N4741
11v
14
1N4742
12v
15
1N4743
13v
16
1N4746
18v

These are different zener diodes you can use as you want. They all have different breakdown voltages, so they can set a different voltage for the voltage level indicator circuit.